The Judicial Commission of the International Committee on Bacteriological Nomenclature is asked to conserve the specific epithet pyocyanea in the bacterial species name Pseudomonas pyocyanea (Gessard) Migula 1895, to designate the species Pseudomonas pyocyanea (Gessard) Migula as the nomenclatural type species of the genus Pseudomonas, and to place the species name Pseudomonas aeruginosa (Schroeter) Migula 1900 in the list of nomina rejicienda.
A 42-year-old collection of dried specimens of streptomycetes was examined. Insofar as possible, their characteristics were compared with those of living descendants of the cultures available from three major culture collections. The dried specimens represent 24 holotypes and 10 potential neo-types. None of the dried specimens was viable. Although color of aerial mycelium and spore-wall characteristics were retained, determination of colors of vegetative mycelium and diffusible pigments could not be made with confidence. Determination of morphology of spore chains was not particularly successful because preparation of materials for examination was difficult. Characteristics of the dried specimens showed a remarkable degree of similarity to comparable ones of their living counterparts. In only a few instances were determinations sufficiently different to place question on the authenticity of available living types. The results afford a sounder basis for taxonomic investigations of the streptomycetes.
It is proposed that similarity between genetic determinants is the most appropriate criterion for setting up a microbial classification. Genetic homology between organisms can be discovered by biological tests for hybridization, or by physicohemical tests for renaturation between single-stranded DNA's of diverse origin.
A new Salmonella serotype ((6), (7), 14:b:-) was described and the designation S. nissii was assigned to it. The strain was isolated from a sailor who became ill after eating unripe fruit after leaving Japan.
Achromobacter nematophilus sp. nov., isolated from the intestinal lumen of a species of Neoaplectana (Steinernematidae: Nematoda), is described. It can be distinguished from other species of Achromobacter by its larger cell size and action on gelatin and litmus milk.